Clinical Psychology | Psychology | Medicine | Biology

Psychology

The core idea in plain words

Psychology is the science of mind and behaviour: why we think, feel and act the way we do. Philosophers asked these questions for two thousand years; psychology is what happened when, in the late nineteenth century, people like Wilhelm Wundt and William James started trying to answer them with experiments.

It covers a lot of ground: how the brain turns light into a face you recognise, why you forget names, how children learn language, why a crowd will do what no individual in it would, and how to help someone climb out of depression.

The main schools, in one breath

• Psychoanalysis (Freud) — hidden, unconscious drives shape us. Influential, mostly untestable, largely abandoned as science but alive in culture.
• Behaviourism (Watson, Skinner) — forget the mind; study stimulus and response. Gave us conditioning and still powers animal training and habit design.
• Cognitive psychology — the mind as an information processor: attention, memory, reasoning. Dominant since the 1960s.
• Humanistic psychology (Maslow, Rogers) — the whole person, growth and meaning.
• Evolutionary and social psychology — why we evolved our instincts, and how other people bend our behaviour.
• Neuroscience — the hardware underneath it all.

An analogy: the rider and the elephant

Jonathan Haidt’s image is the best I know. Your mind is a small rider sitting on a huge elephant. The rider is conscious reasoning: slow, verbal, the part that thinks it is in charge. The elephant is everything else: emotions, habits, intuitions, fast automatic judgements. Mostly the elephant goes where it wants, and the rider’s main skill is making up good-sounding reasons afterwards.

Much of psychology is the study of the elephant. Much of good therapy is teaching the rider to steer gently rather than shout.

A worked example: obedience and ordinary men

In 1961 Stanley Milgram ran his famous experiment at Yale. Volunteers were told they were helping study learning; whenever a “learner” (an actor in another room) got an answer wrong, they had to press a switch giving him an electric shock, rising in 15-volt steps to 450 volts. No shocks were real, but the volunteers believed they were.

Before the study, psychiatrists predicted that only a tiny fraction — about one in a thousand — would go to the end. In the best-known version, 26 of 40 people (65%) went all the way to 450 volts, while hearing protests and then silence, prompted only by a man in a grey lab coat saying “The experiment requires that you continue.”

What changed the numbers? When the experimenter gave orders by phone, obedience dropped sharply. When two other “teachers” refused, most real volunteers refused too. When the volunteer had to press the learner’s hand onto the plate, obedience fell to about 30%. Distance and authority made cruelty easy; a single dissenting peer made defiance easy.

The historian Christopher Browning found the same pattern in real life, in his book Ordinary Men, about a German police battalion in Poland in 1942. Most men took part in mass shootings, not out of hatred but out of conformity and not wanting to leave the dirty work to their comrades. A few refused, and nothing terrible happened to them. Psychology’s sobering lesson: situations are far more powerful than we think, and the best protection is knowing it.

Common misconceptions

• “We only use 10% of our brains.” Brain scans show activity everywhere; there is no idle 90%.
• “Left-brained people are logical, right-brained people creative.” The hemispheres specialise a little, but every real task uses both.
• “Memory is a recording.” Memory is reconstructed every time you recall it, and can be confidently wrong. Eyewitnesses convict innocent people this way.
• “Venting anger gets it out of your system.” Studies show venting usually makes you angrier. Calming down works better.
• “Psychology is just common sense.” Common sense predicted almost no one would obey Milgram.

A word on the replication crisis

In the 2010s, large projects tried to repeat famous psychology findings and many failed — “ego depletion” and some “priming” effects among them. This was painful but healthy. The field now increasingly pre-registers studies and uses larger samples. Treat any single surprising psychology headline with caution; trust findings that have been repeated many times. Milgram’s basic result, for what it’s worth, has been replicated in several countries.

Connections

• Medicine — psychiatry, and the body side of mental health.
• Biology — the evolved brain.
• The Righteous Mind — Haidt’s rider and elephant applied to morality and politics.
• Ordinary Men — Browning’s study of how ordinary people commit atrocities.
• Ethics — what we ought to do, as opposed to what we actually do.
• Meditation — the oldest practical psychology there is.